摘要：

A series of new rheniumiiicomplexes, ReL2, where LH a 2-formylpyridine thiosemicarbazone have been synthesised and characterised. The complexes have been synthesised from the Revstarting material ReOCl3PPh32and from ReO4in the presence of triphenylphosphine. All of the new compounds have been characterised by X-ray crystallography, NMR and mass spectroscopy. In all cases the Re atom is in a distorted octahedral environment with two tridentate deprotonated thiosemicarbazones binding as monoanionic ligands through the sulfur, pyridyl nitrogen and azamethinic nitrogen in amerazomethine nitrogen atomstransconfiguration. Electrochemical measurements show that the complexes undergo two reversible reductions at biologically accessible potentials. Under certain conditions the 2-formylpyridine thiosemicarbazone ligands undergo reductive cleavage of the hydrazinic N–N bond resulting in the formation of a rhenium complex of methyl2-pyridylmethyleneimine which has been characterised by X-ray crystallography.

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